> 1) Please answer, can the Babyface Pro FS be left on all the time?
Yes, but you have then some more wear on some electronic parts, the usual thing.
> 2) If the Babyface Pro FS is not switched off, will this affect its performance in the future?
No not the performance, only the lifetime of certain components, the usual thing with electronics.
Power-off devices, if you do not need them for several hours to save energy and for a little longer lifetime. But do not overshoot here, too frequent power-cycles are also not good and cause more stress on certain part of the electronic circuit.
> I read the instructions, but I didn't find the answer there,
Nobody will be able to tell you .. what usage pattern will lead to this or that lifespan, this is simply impossible.
There is no right or wrong, if you need a device then use it. And fridges need to keep a certain temperature every day...
> I bought it on credit, and I will be very offended if something happens to it.
Well then avoid unnecessary wear, but without overshooting as I said not to cause even more stress to the electronic.
Don't worry too much .. Synthax UK even gives 5y warranty based on the good experience they had with RME devices.
https://forum.rme-audio.de/viewtopic.ph … 33#p163733
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub14